Re: [time-nuts] Looking for Z3801 Power Supply Board

[paul swed]

Boy do I agree with Dave's comments. Even if the big block inverter is bad
it can all be replaced. I have a small inverting supply in my unit to
replace one leg. I think it was the -5V supply. Its been running for 7 plus
years.
Good luck
Regards
Paul
WB8TSL

On Mon, May 23, 2016 at 6:54 PM, Dave M  wrote:

> Dan,
> If you haven't already found the Z3801A page at
> http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should read
> it thoroughly (in your case, especialy the section on the power supply).
> there is a good pictorial that shows locations of all the power supply test
> points. Using that pictorial, you should be able to determine which power
> supply is causing the problem (there are several).
>
> Otherwise, (I'm sure you're well aware) if you're set on getting a
> replacement PSU assembly, you're probably looking at buying a parts unit
> and salvaging the PSU board from it.  However, you might find that the
> parts unit also has a bad PSU.  It's a chance you take.
>
> Cheers,
> Dave M
>
>
>
> Dan Rae wrote:
>
>> My Z3801 power supply board has given up the ghost.  It had been
>> working well apart from an occasional Error 230 causing it to go into
>> Holdover for no good reason from time to time which may well be related of
>> course.
>> Does anyone have a good power supply from an otherwise dead unit which
>> might enable me to get it going again?
>>
>> I've had the darn thing for fifteen years and miss it :^)
>>
>> Dan
>>
>
>
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Re: [time-nuts] Looking for Z3801 Power Supply Board

[Dan Rae]

On 5/23/2016 3:54 PM, Dave M wrote:

Dan,
If you haven't already found the Z3801A page at 
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should 
read it thoroughly (in your case, especialy the section on the power 
supply).  there is a good pictorial that shows locations of all the 
power supply test points. Using that pictorial, you should be able to 
determine which power supply is causing the problem (there are several).
Dave, it's completely dead.  I do have a schematic of the board (of 
uncertain origin), but I suspect it is one of the DC/DC convertors that 
is dead.  It just puts the power supply I'm feeding it from into tick 
mode but I can't find any obvious short anywhere.  It could be a 
Tantalum inside one of the aforesaid convertors, but it's not blown any 
pico fuses.


I will continue to puzzle over it...

Dan

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Re: [time-nuts] Looking for Z3801 Power Supply Board

[Dave M]

Dan,
If you haven't already found the Z3801A page at 
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should read it 
thoroughly (in your case, especialy the section on the power supply).  there 
is a good pictorial that shows locations of all the power supply test 
points. Using that pictorial, you should be able to determine which power 
supply is causing the problem (there are several).


Otherwise, (I'm sure you're well aware) if you're set on getting a 
replacement PSU assembly, you're probably looking at buying a parts unit and 
salvaging the PSU board from it.  However, you might find that the parts 
unit also has a bad PSU.  It's a chance you take.


Cheers,
Dave M


Dan Rae wrote:

My Z3801 power supply board has given up the ghost.  It had been
working well apart from an occasional Error 230 causing it to go into
Holdover for no good reason from time to time which may well be related of
course.
Does anyone have a good power supply from an otherwise dead unit which
might enable me to get it going again?

I've had the darn thing for fifteen years and miss it :^)

Dan 



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